- Best to provide a playable demo.
I disagree with this. Akaneiro just added this and the game is in such a.... alpha/beta feel that it really could distract people from further donating that would have. I agree it would help people like "Servant of the Lord" but it certainly could detract people from your concept far before it is fully mature. Perhaps that is why he suggested you have it 90% done. ;)
Personally I would suggest having video of your ingame interactions and show off some unique elements to your game. I know that my game ( being voxel based ) will get the "minecraft clone" bullshit from the early start but once we show them how different it is compared to minecraft they will shut their mouths. To accomplish this in our promo video ( at the start ) we plan to show off the most important unique elements before we show off anything else. Keep that in mind when presenting it, your idea
edit** can a mod merge these two.... sorry i tried but it failed